Support for inductance coils



Aug. 11, 1925. 1,548,857

L. STEINBERGER ET AL SUPPORT FOR INDUCTANCE COILS Filed Feb 23, 1922 Patented Aug. 11, 1925.

TED STATES PATENT OFFICE.

LOUIS STEINBERGER, 0F BROOKLYN, NEW YORK, AND GUY HILL, OF WASHINGTON, DISTRICT OF GOLUMBIA.

SUPPORT FOR INDUGTANCE COILS.

Application filed February 23, 1922. Serial. No. 538,553.

To all whom it may concern:

Be it known that we, LOUlS Srismnnncnn and GUY HILL, citizens of the United States, and residents, respectively, of the borough of Brooklyn, county of Kings, city and State of New York, and Washington, District of Columbia, have jointly invented certain new and useful Improvements in Supports for Inductance Coils, of which the following is a specification.

@ur invention relates particularly to the construction of a flat spiral inductance coil designed to withstand high voltages such as are used in radio transmitting sets.

The general construction of the inductance is similar to that described in our Patent No. 1,342,303 of June 1, 1920. The present invention, however, covers certain improvements and modifications.

The main object of this invention is to provide an inductance coil for radio transmitting systems so' that a maximum of inductance can be obtained within a iven diameter. Another object is to provide an inductance coil that shall have high insulating properties and great mechanical strength.

H the inductance coil had the outer rim, or circumference 6, made of insulating material the coil would occupy the same diam eter as the coil illustrated in Figure 1 but the total available inductance would be considerably reduced. By making the outer supporting rim 6 of a conductor an additional turn or inductance is obtained, and satisfactory mechanical support for the ends of the spokes 3. in cases where the available space is limited, the use of such a metal rim, which can form part of the inductance, is of great advantage.

Since, as stated above, this inductance coil is similar to that referred to in the above patent, only a general description will be given of those features which are thoroughl described in the patent referred to and t 1e features of our present improvement will be particularly pointed out.

In the drawings:

gig. 1 shows a plan view of the inductance cor Fig. 2 is a detail on section AA as indicated in Figure 1, the same being enlarged.

Fig. 3 is a section on line BB of Fig. 1.

Referring to Fig. l, 1 represents an insulated hub or center. This can be solid, as

shown in the drawing, or it can have a hole in the center, or be designed for holding the bearing of a revolving arm, with contact, as fully set forth in our Patent 1,342,303 of June 1, 1920. 2 represents screws for securing the inner ends of the ipsulating spokes to the hub 1. These screws are preferably made of insulating material such as horn fibre.

3 represents an insulated support containing metal inserts i, which are slotted to receive conductor 5.

The inserts 4: can be made in the various forms and secured in the various ways as described in our Patent No. 1,342,303 and as this invention does not relate to the details of these spokes, it is considered no detailed description is necessary. 5 represents a spiral copper conductor, wound as shown in the figure, the conductor being secured to the metal posts l, as indicated. 6 represents a metal rim, preferably of. copper or brass, which forms the outside circumference of the coil. This rim is made of sufficiently substantial size so as to make the coil of rigid construction, and to which the ends of the spokes 3 are secured so as to hold these spokes firmly in position. There is an insulating gap in rim 6, which is indicated by 7 in the drawing. The rim 6 is made in the form indicated in Figure 3, when it is desired to employ a revolving arm, or slider, with this coil so that the slider can not only travel along the coil 5, but can also travel along the rim 6, and thereby enable any portion of the inductance of this coil, including the coil 5 itself and the rim 6, to be put in circuit. That is, the edge of the rim 6 on the same side of the coil on which the copper coil 5 is wound, has a projection or a section of the coil 10 of Figure 3, of the same dimensions as the coil 5, so that the slider, it one is employed, also a clip, if that be used, can make contact with part 10 of rim 6 the same as it would make with coil 5. 7 represents an insulating section that is inserted in rim 6 so as to prevent 6 forming a short circuit around coil 5 and so that 6 can act electrically as a continuation of coil 5 thereby adding one more turn of inductance.

If no revolving arm or slider is to be employed with the coil, the connection between the end of coil 5 and rim 6 can be made by a short curve as indicated at 8.

9 represents the form. of a connection'that llll) should be made between coil 5 and rim 6 in case a revolving arm with a slider is to be employed with this coil, that is, in the latter case, the connection between the end of coil 5 and rim 6 must form a smooth 'curve so that there will be no abrupt change when the slider passes from coil 5 to rim 6.

Referring to Fig. 2, which is a section on the line AA of Fig. 1, 7 represents the insulating material and 3 the end of spoke which the insulated material is secured to by means of screw indicated by 11. 12 represents screws, or rivets, used to attach insulating piece 7 to rim 6.

Figure 3 is shown to illustrate the projection 10 on the metal rim. 6 which should be of the same dimensions as the coil 5 so that, as explained above, it can accomodate a revolving arm with a slider. If no revolving arm and slider are to be used, rim 6 can be of uniform cross-section.

As changes of construction could be made within the scope of our invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A support for an inductance coil having a central hub, spokes radiating therefrom, means carried by the spokes for supporting the coil and an outer metallio'iing secured to said spokes and connected electrically with the coil to form a continuation thereof.

2. In a device of the class described, a central hub, radially extending spokes secured thereto, a spiral eoil supported by said spokes and an outer metal rim carried by saidspokes and electrically connected with an outer convolution of said spiral coil.

3. In a device of the class described, a

central hub, radially extending spokes of insulating material secured thereto, metal inserts secured to said spokes, a spiral metallic coil carried by said inserts and an outer metallic rim secured to said spokes and electrically connected with the spiral coil, said rim having an insulated section.

4. In a device of the class described, a central hub, radially extending spokes secured thereto, a spiral coil supported by said spokes and an outer metal rim carried by said spokes and electrically connected with an outer convolution of said spiral coil.

said rim having an insulated section therein adjacent to the location at which the coil and the rim are joined.

In a device of the class described. a central hub of insulating material, a plurality of radial spokes carried thereby, in serts carried by said spokes, a flat wire inductance coil of spiral formation secured to said inserts, and an outer metallic rim provided with a relatively short section of insulating material secured to said spokes.

6. In a device of the class described, a central hub of insulating material, a plurality of radial spokes carried thereby. slotted metallic inserts carried by said spokes, a spiral inductance coil of rectangular cross section supported by said slotted inserts, and an outer circular rim having a thin portion of substantially the same cross sectional area as said spiral coil and a thicker portion of greater sectional area secured to said spokes, said thin portion being connected to said coil to form a continuation thereof, said rim having an insulated section adjacent the point at which it is joined to the coil.

Signed this 21st day of February, 1922.

LOUIS STEINBERGER.

Signed this 31st day of January, 1922.

GUY HILL. 

